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Our editorial team selected the products on this list based on actual customer reviews on Amazon Australia and our own experience with weed killer. For each category, we carefully selected parameters based on our research and identified the weed-killing products with the highest review score within those parameters.
With an average rating of 4.3/5 from over 420+ Amazon reviews as of October 2020, the Weedol Lawn Weedkiller Gun 1L is a trusted and popular choice with many green thumbs. Though a healthy patch of grass will suffocate most weeds, sometimes a lawn is too big or too weed compromised to allow for that strategy.
Enter the next best option: Weedol's unique combo of three selective herbicides that target the worst lawn offenders while not harming the precious blades of your beloved lawn. Even better, it only requires one application per season.
For those of you who want to take a scorched earth approach to things, Roundup 5004010 Extended Control Weed & Grass Killer boasts a 4.5/5 star rating after 5.8K+ Amazon reviews.
A quick warning for you gardening newcomers out there: non-selective herbicides will harm ANY living plant species they come in contact with. So be sure what you're spraying at. All that being said, this potent glyphosate solution should be more than enough if you want to end weeds, grasses, vines and brush stumps and keep them away for four months.
Impressively, Roundup 5004010 Extended Control Weed & Grass Killer comes in a wide variety of package options. You can purchase it as a ready-to-use or concentrate solution as well as with wands or a pump-pack.
If you're after a cost-effective, non-selective means to keep your garden in order, best look to Compare-N-Save's 016869 Concentrate Grass and Weed Killer with its 4.4/5 star rating after a whopping 12K+ Amazon reviews. It's effectively designed to eliminate anything green you point and spray at, so do be mindful of current wind conditions.
All that being said, this 41% glyphosate solution should be more than enough if you want to end weeds, grasses, vines and brush stumps before they can overtake your garden. Better yet, it's rainproof in two hours (some competing brands advise four to six hours in comparison).
Compare-N-Save 016869 Concentrate Grass and Weed Killer comes in 940ml, 3.7l and 5.6l bottles.
More expensive than your average weed solution, Lilly Miller Brands RTU Casoron Granules still comes highly recommended with a 4.5/5 Amazon rating after 80 reviews. Most likely because this is a once-a-year solution that has been designed to be used around roses and other especially precious or temperamental plants.
After application (ideally with a soil spreader bought from your local hardware store,) Casoron Granules are designed to dissolve with a bit of water and work overnight to kill and then inhibit new weed growth. Quick warning, though: this is a barrier solution – shifting around the soil from the site of use will reduce this product's effectiveness.
Hailing from a horticultural brand that's been active for over 70 years, Preen's Garden Weed Preventer Granules is a product that enjoys a 4.5/5 star rating after 1,100+ Amazon reviews. It's been designed to block weeds for up to 3 months, and a 2.5kg bag will get you 270 square metres worth of coverage.
Activated with water and formulated to be used safely around 200+ flowers, veggies, trees and shrubs, these granules can be applied basically any time except winter. Once laid down, a weed-preventing barrier forms that won't leech into your groundwater or wash away.
Preen 2464110 Garden Weed Preventer comes in a variety of sizes including 2.5kg, 5.8kg, 7.2kg and 14kg bags.
If you have large swathes of weeds to destroy, you should check out Southern Ag's Amine 2,4-D weed killer as it has a rating of 4.4/5 from more than 2,000 Amazon reviews. It's worth noting that we've limited our selection process here to selective weed killers as they're more versatile and therefore desirable to gardeners.
One of the best products to kill broadleaf weeds while also being useful in rangeland, pastures, turf and ditch bans, this product takes roughly two weeks to show its effects. Don't own acreage? Well, then there's enough in a bottle to keep a suburbanite lawn for ages.
Southern Ag Amine 2,4-D Weed killer comes in 940ml and 3.7l bottles.
Roughly 6 times stronger than vinegar, Natural Armor 30% Home & Garden Vinegar is the au naturel weed killer that's earned a rating of 4.5/5 after 1,300+ Amazon reviews. And as a bonus, it's not only great for nixing the noxious ones, it can also be used as a deodorizer and industrial-strength cleaner of surfaces and appliances.
Used outside, it's an eco-friendly, non-selective option that's best used to de-weed driveway, patios, pool areas, foundations and the like. To keep packaging waste down, it can also be purchased in a refill option.
It can also be purchased in 3.7l or 945ml bottles.
If you need to keep a weed-free garden that's also home to an inquisitive furry loved one, OrganicMatters' Vinegar 30% Industrial Concentrate has 4.5/5 star rating after 151 Amazon reviews.
Devoid of the glyphosate chemical that's in most other similarly marketed products, OrganicMatters is non-toxic, non-GMO, biodegradable and all natural. In fact, it's basically concentrated vinegar mixed into water – a very effective and comparatively safe weed-killing formula.
The above blends can be bought in 945ml or 3.7l bottles.
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